/*单行...*/
@mixin ell() {
    text-overflow: ellipsis;
    white-space: nowrap;
    overflow: hidden;
}

/*多行...*/
@mixin ells($clamp : 1) {
    display: -webkit-box;
    -webkit-line-clamp: $clamp;
    -webkit-box-orient: vertical;
    overflow: hidden;
}